The invention relates to a safety valve online detecting test table which comprises a steel plate frame, wherein the left side, the lower surface and the upper surface of the steel plate frame are provided with fixed steel plates; a first rotating shaft transversely penetrates through the left steel plate; the outer end of the first rotating shaft is connected with a detachable handle, and the inner end of the first rotating shaft is connected with a vertical second rotating shaft by two meshed bevel gears; the second rotating shaft is fixed on the lower steel plate; a third shaft doing vertical motion is threaded on the second rotating shaft; the upper end of the third shaft penetrates through the upper steel plate, and a chuck fixed on the upper steel plate is connected with a connecting block; the end part of the connecting block is abutted with a valve seat of a safety valve; a clamp for fixing the safety valve is arranged on the chuck; the third shaft and the connecting block are provided with air passages which lead the air to enter the safety valve, and the air passage of the third shaft is provided with an air opening which is connected with an air pipe. The invention has the advantages of simple operation, good self-locking effect, reliable fixation of the safety valve and good seal effect of the valve seat and the connecting block.